build(rust): vendor rnix parser crate

third_party/crates/text-size-1.1.1/README.md

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+# text-size
+
+[![Build Status](https://travis-ci.org/matklad/text-size.svg?branch=master)](https://travis-ci.org/matklad/text-size)
+[![Crates.io](https://img.shields.io/crates/v/text-size.svg)](https://crates.io/crates/text-size)
+[![API reference](https://docs.rs/text-size/badge.svg)](https://docs.rs/text-size/)
+
+
+A library that provides newtype wrappers for `u32` and `(u32, u32)` for use as text offsets.
+
+See the [docs](https://docs.rs/text-size/) for more.
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0
+   ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license
+   ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.